Mine-shaft.



PATENTED JAN. 15, 1907.

J. MIKA.

MINE SHAFT.

APPLICATION FILED APR.4,1906-.

11;: uumus psrsn; co., wnsnmamm n. c,

'UNITED STATES PATENT OFFICE.

Specification of Letters Patent. Application filed April 4,1906. Serial No. 309,951.

Patented Jan. 15, 1907.

To (LZZ whom, it may concern:

Be it known that I, J OSEF MIKA, miner, a subject of the German Emperor, and a resident of Bottrop, Germany, have invented certain new and useful Improvements in Mine-Shafts, of which the following is a specification.

This invention relates to improvements in mine-shafts and its object is to provide simple and efficient means by which the opening of the shaft for the entrance of the miners trucks on the cagecan be held closed, so that the trucks are prevented from entering the shaft unintentionally. The accompanying drawings show how this is accomplished.

Figure 1 is a side view, and Fig. 2 a front view, of the new device.

In the two track-ledges a a of the shaft iron rods 1) b are pivotally mounted and connected at their front end by a solid or hollow-rod c, destined to close the shaft-opening. At the other end the iron rods 7) b are provided with projections which when the shaft-opening is held closedi. e., in the case when the cage has gone down belowpro j ect beyond the track-ledges, as this is shown in dotted lines in Fig. 1. As soon as the cage ascends in the shaft and reaches its normal level adapted to receive the truck the guides of the cage push the projections of the rods 1) b aside into slots d d, provided for this purpose in the track-ledges a a. The rods b b, acting then as double-armed levers, are lifted, and with them the rod 0, coming thus into the position shown in full lines in Fig. l and giving free the opening for the entrance of the truck to the cage.

Having fully described my invention, what I I claim, and desire to secure by Letters Patent, is

In a mine-shaft, means for closing the opening of the shaft, comprising, in combination, a rod 0 destined to close the shaft-opening, and two rods 1), b pivotally mounted in the two track-ledges of the shaft and connected at their front endsby said rod 0 and provided at their rear ends with projections adapted to project, when the shaft-opening is held closed, beyond the track-ledges and to be pushed aside, when the shaft-opening is being opened, into slots provided in said trackledges of the shaft, and thus to be lifted together with said rod 0 for opening the en trance to the shaft, substantially as described and shown.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOSEF MIKA. Witnesses:

WILLIAM ESSENWEIN, ALFR. POHLMEYER. 

